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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91d3eb59f9113c8035be4ef36d6386360fd979503e9bd5eaf279a05150b2df8' 
  AND token = 'Vr2whkXnAAEkt/BsL/ineYKRXGiXqaSuxwocmr7BzAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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