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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ef6024054f323c8b7a5d94111cea6f890403188e7d8c2e4c23974133a44955' 
  AND token = 'Sw057RAkqhPd88p5sTAo4rbw3jfBRB8FjwWRKUlERbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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