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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083eb6d7384d67fc245c8ee6a6928ca43a1e0ffa2aa4a039b8ab024eff160426' 
  AND token = '7GCnusDMIKky4A1i1H22l/jdTNsQ8tf0PXhA0arui4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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