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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75cf08919b1f7cf5a816e3fa5ef8aea1d4359ec277e861db2d44cb737e43374e' 
  AND token = 'Asy87Tobc3pdlU9CiWJN9pdjtfqcm/rX2z+YPy6sv9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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