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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4787432c4234f8a8593072776dce4b919501e4de16df0fc5ac673422fc0ec3e0' 
  AND token = 'CNyLA4Qr9KyrHk2O9cOr4MCpPB7QHvM6BpHgMYOFTDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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