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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4bbc6129fdb376c4ac4996ccd8e748a972483dbdd8355850af023a662b2a2a' 
  AND token = 'Fsum5fwNzcT1nbnaKNMcn+mow83yRsYK6e6gWb1nAJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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