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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedac73730d862d21fd5cebf3c68852dd9a627ff7d42a31eae8217bfa23d3745' 
  AND token = 'saJ98vPHkJq7G1U0YHUtX1VtFIfAyFQLIDIp9GdAda0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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