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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90597a64691d2a62887a2a90062928b4ce2a6089f51a5229c0031ed77739ae0a' 
  AND token = 'crxryxbE7ZBr7bjDmhtVzk1bVd1sz1qWmDJ/eiL45+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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