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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bad8367e1e965a1a0a112ae72bbf78d17303d51e157590647249b16bc44cbe' 
  AND token = 'DMw/wAMpjK1otgj3HCumbGepRJj6/GnL3M1I1gfu89c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}