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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0d24e63ec9aaf5a5e743640c6abbca1ff652fe0781ff1d8d8335f6db46dbbc' 
  AND token = 'aH2WAiOAviIgYPJuDsxKXS/cLUVN2ndchs5/fy6kVwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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