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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7202eef561273b186e37067cb3ffc5e9832f7384afa2190ee5d6c8288e82f516' 
  AND token = 'z/K13fpmOSie37IpnqvI9xy1oIsSL/MH/FEyoji61TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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