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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32b7a29fab6e9256182ce1769401deb82e3ba12d1cc35a2d7653e45fdae85a4' 
  AND token = '3XsBdzxbJnX/aQwQeMS03ZrtdXZj7pcZA6T3XVkF8b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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