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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacfcf195c2ddc0ef2c6e0da741ef2483f2852db107a889e0b333d9897167f72' 
  AND token = 'xvX5JyYwfI74bj+16kWI5BAjPdn65i5UbFBQuQjEWzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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