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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d4ade5631c50a21fcc503f4c619717589c000b45b43ff3c74dbb3dc1aea575' 
  AND token = 'qenUpdtRQsdpUtCTeBm40RdLtdQfs0OGxp3D01kDr8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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