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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fdd18a73092769d5774c0f6a3f8f630c3668448f77919bb90fd76e86df7186' 
  AND token = 'x7b/7SEFRKg3yhYHz5fJHIyw6eEQx8pphQzVJgXMDxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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