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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd9579a906010d7b34947b3973b0ec8c441f3db3cd8dc39ef8ad6fe6aba2ae5' 
  AND token = 'fHleESqVGtK16Pksqa6yuahWajDamKgePqIAOcFipRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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