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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a70eed5c3440e4b5d77038d61791f82c62b31a63fda7652930b27c3d5471ed' 
  AND token = 'CphJ8OwqTL3+qkp4c8p86YD4pNgYryVDrbSbJgN8yEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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