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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa5d98abaa1eb270f6b53ccb3dcc87012b9dd87cb229d49f31251286ef5630b' 
  AND token = '+xjhCMRqAwKr1UrEONSlNyI8fqXMmCy0/4KMSw1IJds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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