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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dda0a26530f0f20ee18a6c6aed8dd1d59b1d977f3ac0e998147b4eb6c00efea' 
  AND token = 'EeLLy+RA76MCmlsPl59FoeMK2dvzGERtMlrCp9eLSJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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