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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1c4dd699e19885035eca03ff881d570b6b153b5a9c6e75abf19ea23b3e339b' 
  AND token = 'p4tjXejzLKiy/+5JyxP8quMjTBARWKGO/FL12Hud+Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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