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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf217e7eb3b61ef7c6c24c48bfdfd2e66068f3c508da561af89d5a0fcc243c2' 
  AND token = 'xP4GjLz9hZFKF1cYIRoiBCycBx9XmsZ6tpIs7N5hsGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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