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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40bd3b5a95e580dc9fb0041d33af47b686a1020cc7f758f81080005b5ed03b2' 
  AND token = 'gFlnHONoHt15jv8DYdjVtvajyHbpjccMOO6iMvXqLNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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