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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ef51bb544ade6c696ef0a1874d677046f3d63d6fb6de305943f432dc58cd9a' 
  AND token = 'FLm/EOOkhj5SSU64Ow8P3uYnfPCgHzZ9Ar9WaOUHC4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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