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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf13564e1bfa3e32095d522f565f1788fabf024e29a533ec6893cd42bfe6ecd' 
  AND token = '6EkV77QU7VHrsTCtEtDKGKXah+swQi+7hXwaMr+/QGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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