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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7b3729ca2205c98c4e105c5df32ffbf35c3d4704748300113db9e9707c7c55' 
  AND token = 'Lx5v5jZjHUEgLmQl2MZw/L3lhStwy9+XOmFW2wWx3Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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