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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb82ac0b0c7f4425bdf3825428a89302b751a74e4794d85b2eb8bad5520b83ea' 
  AND token = 'Iyfu9yAHS8SjuZ5lTR8Yo9Lp8z1ckJ+xb/vJIGEMOR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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