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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac1517c3389bb8120277500c8ce5718f7ae276d7bc6e26a55b116a5a2604cc6' 
  AND token = 'n3LjmII84EWLmNaCtBH2WZhj90A42usUjGNmjY3SB3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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