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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9a99bb02c3c44f38ae53d42de989e1217568ed9f3ed832cc3b8ac886a93725' 
  AND token = '95viAJIOuO9ahRLVHKzTLOFFJxr6SAPDp475YMn99v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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