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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea1278b0c265345d0b62cf05ef00c2d97cdca551ab3ad6c9554065e867bd3ac' 
  AND token = '2u6oruArg8O3yknaNzkorNnVRauxIYtaTN6Rsonc/d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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