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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a55c00b4802b87fa9da7242048dcacc9546dbc3aacd08b55a4d5d46b0ccf97' 
  AND token = 'kvBGAjyNH9nbS/J4zgM+dGblzkfAo96jnzt4ZPWiriA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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