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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f2f45d8a2e9ff3a12f69814061651c46aec11aa32931a382e3a958b09df42b' 
  AND token = 'co4tBz3RALd3I1Lzgp6xSTKiYmb51Q1JS3WZopSFO0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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