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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f803791fe39f472c647aa27d6cb0c643e042d752c2c07ac48a26bd31d0ff21' 
  AND token = '+j1u1t7fAqic3hnQKRLBB+kATINHwdiGCP54xvMKQcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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