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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98f71f06dc58705ada4e61774184e1fb0009eb4b9a0e506f297b1b5a153f3f6' 
  AND token = '+9mp8XyI0wesZkBjDZ/1KfBJAGThTOj0gIQGS905wcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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