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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55962e2cbf926ec10956935f5b3883127fc437ddfa342dd4f7f2e82cc756e14' 
  AND token = 'bfXJqlBC1jXz+not9E+xei4ugmisnzOnkguYkk3azPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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