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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef60b5c179f2500dc9610a80348600cff737226a4dd396b3163eb681dcf934e2' 
  AND token = 'Rkx44HFMUy7Ldd4/LpPojRKi5Rb6t3xR0Bb0l6yDCqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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