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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db5e451a18c7100d1dd8f9de0af6f285bd60e15294a3b6893a1444779f5fbf1' 
  AND token = 'R2sRLX0Ch5js0Kux49P6YRr+OO56mH+sVQZfQb/JUR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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