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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77156adc7540a78ddba246a0e1504aa07f66cbaf9a0d0a5e7f59c26a8dce72f5' 
  AND token = 'soebUFfRdv0djkkwSyO9O7klwx65fKpjQtyMMPdPaHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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