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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5cb3d7696c8e0d4eb1a9ec13eea04a975f25fb642bba50360cc69dc4bf4c55' 
  AND token = 'AGvABsGA1PLRcmd2as5Kn+H+g+hidy1xce0uL3nU+sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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