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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753fe605eca33d562d0ee592bc5577d812b7e77948b82cafbe5eeb3a63bf6be2' 
  AND token = 'zCGrDEbbwUePKd1fdPWH4oS63k/eV2Trs8y+tivO6Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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