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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1680a376dae885fe2f19faf28082e286a0cefd55cdce6bc13df6ac6c77dbb0' 
  AND token = 'KtNugDZa54YyVmLUVbzzpAKN8amR03YbfaaJWx4RPF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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