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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29380cc8e02db1c6e4d713ba05460a16d062a77d50e9e61c5764b3a334a30873' 
  AND token = '9Oi14N3aHraDSSDWZrgjuAffBj/tE+LVXTN1j3MXX1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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