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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba70fc6f70b99109300f44b2cad0d1306ff774b399193125b5f0eef4bb3c87bb' 
  AND token = 'vvoVjuPJtkjaTaiYN2h94w31XQYZ/787vgfyhbr22TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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