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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ac0772d3e02c0787c8c036f53a79f494ac2188f8c01500e5a916e321ae2f8b' 
  AND token = 'J8kn7rlx21fuHoq2T29cL+588fV5gR/gtPerSW7CFik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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