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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc5bca087c3d3f8a79eebf3088774dfaa14f617a398a149593c0f70251a240b' 
  AND token = 'WVtUVbhvbuXW4318vboL6DUU626tIcNR2e1zq+73c1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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