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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ee73c4d80bfd91904725af0660edc7e19adb68e1a6f81c9c45c458f6e0c005' 
  AND token = '+Yn3J7D8Oy48PgfU1z6NHvqsA08MLv2/rTHsFocSWEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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