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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e35980de05f6de677f909d5d266fcad8ca689658adde038c6f24f40b3359b4c' 
  AND token = 'cIF9u1dcm/T3+u0tOpIXWhVLm06OxaF8wZCCf5+Oro0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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